[EVDL List]

AS I watched 15 trucks burn, in a tunnel shutting down
California's main North-South highway I could not help
thinking we should publicize EVs would never do that.

I am watching the evolution of the golf cart to the
Neighborhood EV, and people attempting to push the
speed limits higher I see the college campus as a major
influence as they adopt NEVs. The kids on campus are
being exposed, and some will adopt the NEV while in
school, but be willing and want to adopt EVs after
graduation. We should encourage this evolutionary
path. The next generation should be prepared.

John in Sylmar, CA
Home of the 15-truck tunnel disaster. Not the first
tunnel disaster in Sylmar.

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You are in error. Fires do and can happen with EVs.
There have been a couple of publicized fires from
electric vehicles within the last year. Check the
archives. Now granted these fires were from improper
charging, manufacturer wiring, and building wiring of
unattended vehicles, but it still illustrates that
fires can occur with EVs. These fires can be
catastrophic depending on the lack of safety
precautions used and battery chemistry.

In addition, due to the higher voltage and AMPERAGE
required of some vehicles (BTW which is more than
enough to weld steel) a short can be deadly,
especially after a collision, inwhich power components
can become shifted and an uncontrollable fire results.
Will it be as deadly as spilled gas, we hope not.
But it is not unreasonable to imagine a multi car
pile-up with EV and ICE vehicles igniting together
(some spilled fuel igniting from a spark from any
source whether from the EV or something else)

In reaction to EV fires, some EMS and fire services
have been hesitant about proper responses from lack of
knowledge, differing standards for wiring between
homebuilt and production models, and fear of
electrical shock. That's why several EAA
organizations have been doing outreach programs
demonstrating to local safety responders their
vehicles. http://www.seattleeva.org/

--- JS wrote:

> AS I watched 15 trucks burn, in a tunnel shutting
> down
> California's main North-South highway I could not
> help
> thinking we should publicize EVs would never do
> that.
>
> I am watching the evolution of the golf cart to the
> Neighborhood EV, and people attempting to push the
> speed limits higher I see the college campus as a
> major
> influence as they adopt NEVs. The kids on campus
> are
> being exposed, and some will adopt the NEV while in
> school, but be willing and want to adopt EVs after
> graduation. We should encourage this evolutionary
> path. The next generation should be prepared.
>
> John in Sylmar, CA
> Home of the 15-truck tunnel disaster. Not the first
> tunnel disaster in Sylmar.
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>




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I know its too much to expect right now being as most ev's on the road righ=
t now are either home-built or limited duty, but for a couple years know on=
e of the European car manufacturers (I think its mercedes but I am not sure=
at this point) has been putting a small explosive charge in their battery =
cables in the event of an airbag being set off it also sets off that charge=
which separates the cable from the battery I think that sort of safety dev=
ice could go a long way toward addressing safety issues with EV's especiall=
y in accident scenario's
> =

> In addition, due to the higher voltage and AMPERAGE
> required of some vehicles (BTW which is more than
> enough to weld steel) a short can be deadly,
> especially after a collision, inwhich power components
> can become shifted and an uncontrollable fire results.
> Will it be as deadly as spilled gas, we hope not. =

> But it is not unreasonable to imagine a multi car
> pile-up with EV and ICE vehicles igniting together
> (some spilled fuel igniting from a spark from any
> source whether from the EV or something else)
> =

> In reaction to EV fires, some EMS and fire services
> have been hesitant about proper responses from lack of
> knowledge, differing standards for wiring between
> homebuilt and production models, and fear of
> electrical shock. That's why several EAA
> organizations have been doing outreach programs
> demonstrating to local safety responders their
> vehicles. http://www.seattleeva.org/
> =



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The first time I heard about the det-cord fuse was for miltary UPS systems.

Why is that any different than a good contactor that springs open, Just
have to move it closer to the pack.

But where do you put this? mid pack? then you still have half a pack to
worry about when body parts can short. Shutting off a fuel pump removes
the pressure to flow. The potential of a battery to flow energy is
still there, we have to interrupt it everywhere?

My solutions would be

1) to get rid of metal as the primary construction medium for EV's.
2) To put interruption in the modules and make the modules larger
and crushable. Perhaps standardize on one pack voltage, say 300v, and
create 300Vx8ah slices (then you could add capacity without changing
system voltage.) Each module would weigh just over 60lbs when we are
talking about advanced chemistries and could then have individual shutdown.

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The one I have came with flimsy wiring, maybe 22-24 AWG. I use a relay to supply 12 VDC to operate my main contactors and wired the inertia switch inline with the coil of this relay.



----- Original Message ----
From: David Nelson <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Sent: Sunday, October 14, 2007 1:17:58 AM
Subject: Re: [EVDL] The EV evolutionary path


What about those inertia switches I've heard about? Don't they break
the connection to the batteries? If so, where should they be placed in
the circuit?






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From: Jeff Shanab
>The first time I heard about the det-cord fuse was for miltary UPS
> systems. Why is that any different than a good contactor that
> springs open?

Becaus it's probably cheaper, and requires a trip to a dealer for a special replacement part.

--
"Excellence does not require perfection." -- Henry James
--
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